Weather in Mykonos in September 2025
Average weather
Average temperature in Mykonos in September
Going from a maximum of +26°C during the day to a minimum of +21°C during the night, the temperature in September averages around +24°C.
The average maximum temperature goes down 60% by the end of the month, compared with the beginning of the month, from +26°C to +23°C.
Is Mykonos warm or cold in September?
Mykonos is typically warm in September.
Maximum temperatures go down compared to the previous month from +27°C to +25°C. The minimum temperature also goes down from +24°C to +22°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the warmest months in Mykonos, here is the comparison with other months:
Water temperature in Mykonos in September
Water in Mykonos in September is Comfortable. It varies from +22°C to +25°C, with an average of +23°C. This is almost similar to the air temperature, which averages +25°C.
The water temperature in September is one of the warmest of the entire year:
Can you swim in Mykonos in September?
Climate in Mykonos in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +27°C | +25°C | +21°C | ||||
| Min. temperature | ||||||
| +20°C | +15°C | +11°C | ||||
| Max. temperature | ||||||
| +38°C | +36°C | +33°C | ||||
| Rainfall | ||||||
| 1 mm | 4 mm | 26 mm | ||||
| Wind | ||||||
| 7 m/s | 6 m/s | 6 m/s | ||||
| Avg. water temperature | ||||||
| +25°C | +23°C | +21°C | ||||
| Humidity | ||||||
| 71% | 72% | 74% | ||||
| Air pressure | ||||||
| 1009 HPa | 1013 HPa | 1015 HPa | ||||
| Sunny days | ||||||
| 30 | 25 | 16 | ||||
| Cloudy days | ||||||
| 0 | 3 | 9 | ||||
| Rainy days | ||||||
| 0 | 2 | 5 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as great as in August. It’s getting colder in September. From +27°C in the day, the average maximum temperature lowers to +25°C. Prepare for more rain. Average rainfall goes from 1 mm to 4 mm. Humidity rises from 71% to 72%. Winds are calmer in comparison to August, going down from 7 m/s to 6 m/s on average. The days becoming less sunny, going from 30 sunny days in August to 25 in September.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 7 m/s getting up to 11 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Mykonos is gradually increasing during September, going from 5 m/s to 7 m/s over the course of the month.
How was the weather last September in Mykonos?
Climate Change over Years
The climate in Mykonos in September has not changed much over the last 43 years.
The average temperature was the lowest in 1983 (+18°C) and the highest in 2021 (+23°C). The driest year was 1989 with only 149 mm of rainfall, and the wettest year was 2003 with 694 mm.
FAQ
Is September a good time to visit Mykonos?
Can you sunbathe in Mykonos in September?
Can you swim in Mykonos in September?
Is Mykonos rainy in September?
Is it sunny in Mykonos in September?
Other cities in Greece
Monthly weather in Mykonos
Source of the data
For this page, we’ve looked at the typical weather in Mykonos, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.